Figure 1. Siboglinum vinculatum. A, anterior extremity of body of male, in ventral aspect. B, anterior extremity of body of female, in dorsal aspect. C, same in ventral aspect. D, portion of the tentacle. E, two pinnules. F, zone of aggregated papillae on the ventral side. G, cuticular platelets from from the zone of aggregated papillae. H, annular region in ventral aspect. I, same in dorsal aspect. J, portion of an annulus. K, anterior portion of tube. L, posterior portion of tube.
Abbreviations: an, annulus; c, cephalic rostrum; ca, capillary of pinnule; co, dorsal ciliated region; dp, posterior group of denticulations; f, frenulum; go, genital papilla; ms, mesosoma; mfs, metasoma; p, cuticular platelets; pa, papillae; pi, pinnules; ps protosoma; si, furrow between protosoma and mesosoma; s2, furrow between mesosoma and metasoma; s4, post-tentacular furrow; s5, second furrow of mesosoma; sv, ventral furrow; t, tentacle; vl, lateral vessel of head region, translucent through integument.